Construction material



Patented Jan. 31, 1928.

UNITED STATES PATENT oFFic- BAY P. PERRY, OF UPPER MONTCLAIB, NEW JERSEY, ASSIGNOR TO THE BARRETT COMPANY, A CORPORATION OF JERSEY;

CONSTRUCTION MATERIAL.

No Drawing.

This invention relates to improvements in the manufacture of construction material, such as roofing, siding, etc. More particularly, it' relates to the manufacture of felt 5 sheets, and bodies which are made from a sheets are unsatisfactory. By using water-.

proofing material of such high melting point that it does not become plastic or sticky at 2 the temperatures reached during the drying operation, this difiiculty of sticking to the drying rolls may be overcome, but in such cases, the waterproofing material is generally so hard. and brittle at ordinary tem- 2 peratures that the sheet is correspondingly hard and'brittle when a considerable proportion of the waterproofing material is incor-- porated therein.

Moreover, high melting point waterproofing material is'usually comparatively viscous when melted and the result is that when sheets containing such high melting point waterproofing material are heated and pressed as hereinafter described, the waterproofing material because ofits viscous nature does not at times spread as evenly and thoroughly through this sheet or bodies as would be the case if liquid or. semi-liquid low melting point less viscous waterproofing 4o material were used. 'One of the objects of my invention is to take advantage of the desired rigidity ofsheets which are produced by the use of high melting point waterproofing material while at the same time insuri'ng a thorough distribution of waterproofing material by providing a supplyof low melting point and less viscous waterproofing material'mixed with the high meltihg point relatively viscous waterproofing material.

Another object of my invention is to produce a sheet of felt or building material that has incorporated therein waterproofing material as the sheet' is being formed. .onthe Application filed August 20, 1920. Serial No. 404,786.

give trouble on the paper-makin machine or in sticking to the drying rolls uring the drying operation. Another objec of my invention is to produce a sheet whic 1 shall possess a considerable amount of tensile strength and is less hard and stifi than would be the case if. only very high melting point waterproofing material were incorpdrated therein. In carrying out my invention, I introduce into the watery pulp of paper stockfibers such as rag stock, woodrfibers, straw, etc'., comminuted particles of solid high melting point waterproofing material, such as pitch, asphalt, etc.-, together with an amount of emulsion of liquid or semi-liquid waterproofing materials,'such as flux oil, coal tar, etc. This mixture of fibrous and waterproofing material may be well stirred in the heater and introduced into the vat of a cylindrical paper-making machine, whereupon the sheetcontaining a mixture of the paper stock, high melting point waterproofing material, and the emulsion becomes formed and is picked up by the wet blanket in the ordinary way. The presence of the emulsion appears'to increase considerabl the mechanical strength of the sheet an at the same time no trouble arises due tothe' sheet stick- 7 ing to the hot drying rolls.

In making the emulsion, I may, for example, use about 6 parts of a coal tar residue -melting at approximately 100 F., and 4 parts of clay mixed in water.

In further illustration of this invention, I will now describe a sheet made of specific materials in certain proportions, but it is to be understood that the invention is not restricted to the particular materials nor to the exact proportions used. I may, for example, employ about 70% of pitch'in com-' minuted' particles of a melting point of 300. F. together with 10% of an emulsion such'as described above, and 20% of paper stock. This mixture in the paper making machine readily forms a sheet on the foraminous cylinder which does not stickeither to the foraminous cylinder of the paper making machine, or to the press rolls that are used forsqueezing out the water, or to the dri'ers. A sheet so formed can be made in difierent thlQlfllBSSGS by having different amounts of suction on the paper-maln'ng cylinder and the sheets can be rolled up on number of these sheets may be p1led together and pressed in like manner thus den.-

sifying the sheets andproducing a more desirable distribution of the water-proofing material. The high melting point waterproofing material may possess considerable viscosity evenat the high temperatures used in the pressingope'ration and consequently does not always spread as evenly and uniformly as is sometimes desired, but the low melting point or less viscous waterproofing material that was introduced in the form of an emulsion readily spreads during the hot pressing operation and overcomes the objection that would arise'if only the high melting point waterproofing material were present.

I claim:

1. The herein described process which comprises introducing paper stock, comminuted particles of high melting point waterproofing material and an emulsion of Waterproofing material into a paper makingmachine and forming a sheet therefrom.

2. The herein described process which comprises introducing paper stock, comminuted particles of high melting point I waterproofing material and an emulsion of waterproofing material into a paper making machine and forming a sheet therefrom, and drying said sheet upon hotrhlls.

3. The herein described process which comprises introducing paper stock, comminuted particles of waterproofing material having a melting point considerably above r the boiling point of water and an emulsion I of waterproofing material into a paper making machine and forming a sheet therefrom.

4. The herein described process which comprises introducing paper stock, comminuted particles of Waterproofing material that does not become sticky at the temperature of the drying rolls of an ordinary paper making machine and an emulsion .of Waterchine and forming a sheet therefrom.

proofing material into a paper making ma- 5. The herein described process which comprises introducing paper stock, commiproofing material and an emulsion of vis- I cous waterproofing material into a paper making machine and forminga sheet therefrom. W

v 8.'As an article of manufacture a sheet comprising-fibrous material, high melting point waterproofing material, and low melting point waterproofing material, and clay in substantially the proportion of 20 to 70 to 6 to 4 parts by weight.

In testimony whereof I afiix my signature.

- RAY P. PERRY. 

